Almost all the major brands have been releasing their core apps on to the Play Store as it becomes easy to update those parts without pushing an update to the whole system. Sony has released the Xperia Keyboard in the Google Play Store. Although it is only compatible with Sony Xperia devices running Android 4.4.2 KitKat. Which leaves out a the Xperia Z and Xperia Z1s with T-Mobile (Story gave it a look.). The latest version of Xperia Keyboard (6.4.A.0.6) comes with features such as swipe typing, language learning and predictions. It learns a user’s language through GMail, Facebook and Twitter.
If you happen to have an Xperia device with Android 4.4.2, then be sure to update and give it a whirl. Assuming you haven’t already of course.